<html>
	<head>
		<style>	
			.myClass{
				width:200px;
				height:200px;
				background-color:red;
			}
		</style>
	
	</head>
	<body>
	
		<div>
		

		</div>
	
		<script src="操作类名.js"></script>
	</body>
</html>